Feature: 1. [Smart Ring Sizing Kit] The smart ring sizing kit is the ideal way to find the perfect size, allows you and your loved ones to determine the ideal size before making a purchase. 2. [Non Standard Sizes] Ring sizes may vary slightly from standard ring sizes, so be sure to determine your size using our size kit. Sizes range from 6 to 13, with no half sizes. 3. [Comfortable and Accurate] Properly fitting the ring will ensure the highest data accuracy, comfort, enhancing your overall using experience. 4. [Finger Selection] The ring is suitable for all fingers and can be worn on either hand. For optimal accuracy, it is recommended to wear the ring on the index finger. Determine the size based on the exact size of the finger you intend to wear the ring on. 5. [How to Match] The ring should be securely and comfortably positioned at the base of your finger. Your ring should not rotate while you go about your daily activities. Specification: Item Type: Smart Ring Sizing Kit Material: Plastic. Package List: 8 x Smart Ring Sizing Model